Hi, I have a dect 2035 and began having the same problem. I don't know how the feedback came about but it was suddenly there today when I tried using the phone. After mucking around with one of the handsets I hit the speakerphone button and turned the volume all the way down, it only goes down to a preset minimum, I then turned speakerphone off again and turned the volume for regular handset mode all the way down too. The phone works beautifully again!

Find a small gray box on the outside of your home called a "network interface device". It's likely near your electric meter or somewhere on the rear or side of the house. Open this up with a screwdriver. Find where your line is marked in there. Plug in a simple non-cordless type phone into the rj11 jack inside the interface. If there's still no dial tone call your phone provider and they'll repair the problem for free. Be sure to check it at the interface because the phone company bills for anything past the interface if you don't have a maintenance plan. They put that interface, called a NID, there so you can isolate problems before unnecessarily calling them to dispatch out a technician. If you don't have an interface or can't find it, call the phone company and they'll install one for free.

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The most common cause of static on the line in your home is a bad or loose wire. If all your phones are experiencing the static, it would indicate that the bad wiring is before the first phone. Check the network interface device (NID) on the outside of your home first. If you are able you could bring one of your phone outside and listen to the static as you move wires around inside the NID. Make sure they are all tight and no bare wires are touching or shorting. If you don't find the problem there check as much wiring as you can get to. If you move or affect the problem you should be able to hear it in a handset. Then check all of the phone cords especially handset cords and phone cords on the floor.
I hope this helps you solve the problem. Have a wonderfull day

Recording a Personal GreetingYour answering system comes with a pre-recorded outgoing message or greeting that plays when you receive a call: “Hello, no one is available to take your call. Please leave a message after the tone.” You can record your own personal outgoing greeting. Your recorded greeting must be between two seconds and thirty seconds long.

Press /mute. The system announces the number of new and old messages, then starts to play themessages unless it has no messages.

Press 5 to stop the announcements or message playback. You will hear intermittent beeps indicating that thesystem is in the command waiting mode.

Press 8 to start the recording. The system announces, “Record greeting.” Begin recording after the announcement.

When you finish recording, press 8 again or press 5. You will hear a confirmation tone, and your recordedgreeting plays back for you.

Selecting a GreetingOnce you have recorded a personal greeting, the phone automatically switches to your personal greeting. You can also switch back and forth between the pre-recorded greeting and your own greeting at any time.

Press the /mute. The system announces the number of new and old messages, then starts to play the messages unless it has no messages.

Press 5 to stop the announcements or message playback. You will hear intermittent beeps indicating that the system is in the command waiting mode.

Recording a Personal GreetingPress /mute on the handset. The system announces the number of new and old
messages, and then starts to play the messages unless it has no messages.

Press 5 to stop the announcements or message playback.

You will hear intermittent beeps indicating that the system
is in the command-waiting mode.

Press 8 to start the recording.

The system announces, "Record greeting."

Begin recording after the announcement.

When you finish recording, press 8 again or press 5. You
will hear a confirmation tone, and your recorded greeting plays back for you.

Selecting a Greeting

Once you have recorded a personal greeting, the phone
automatically switches to your personal greeting. You can also switch back and
forth between the pre-recorded greeting and your own greeting at any time.

Press /mute.

The system announces the number of new and old messages, and
then starts to play the messages unless it has no messages.

Press 5 to stop the announcements or message playback.

You will hear intermittent beeps indicating that the system
is in the command waiting mode.

Key in the system PIN (default 0000) and press the PHONE/OK-> The display shows "WAIT _ _ _ _" for a few moments, while the handset searches for a base. Then it shows a list of handset numbers which are still free on the base unit.(For example, "1 34 6" indicates that numbers 1, 3, 4 and 6 are free; 2 and 5 are already assigned to other handsets.)

Key in a free handset number-> After a moment, the display should show the handset's name and number.